In earlier times, people were certain that horse hairs could turn into worms. There is even a group of simple kinds of worms known as horse-hair worms. Consider the following evidence:

• Watering troughs were provided for horses to drink from.

• Hairs were observed to fall from the horse’s mane into the water of the watering trough.

• Long, thin worms were seen to be swimming in the watering troughs.

Since hair is not alive, if this were to occur, it would be a case of spontaneous generation. Devise an experiment that would determine if nonliving horse hairs become living worms.